content: /*
   * Copyright 2017 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.reactive4javaflow.impl.operators;
  
  import hu.akarnokd.reactive4javaflow.*;
  import hu.akarnokd.reactive4javaflow.errors.CompositeThrowable;
  import hu.akarnokd.reactive4javaflow.functionals.*;
  import hu.akarnokd.reactive4javaflow.fused.ConditionalSubscriber;
  import hu.akarnokd.reactive4javaflow.impl.EmptySubscription;
  
  import java.util.Objects;
  import java.util.concurrent.Callable;
  
  public final class EsetlegUsing<T, R> extends Esetleg<T> {
  
      final Callable<R> resourceSupplier;
  
      final CheckedFunction<? super R, ? extends Esetleg<? extends T>> flowSupplier;
  
      final CheckedConsumer<? super R> resourceCleanup;
  
      final boolean eager;
  
      public EsetlegUsing(Callable<R> resourceSupplier, CheckedFunction<? super R, ? extends Esetleg<? extends T>> flowSupplier, CheckedConsumer<? super R> resourceCleanup, boolean eager) {
          this.resourceSupplier = resourceSupplier;
          this.flowSupplier = flowSupplier;
          this.resourceCleanup = resourceCleanup;
          this.eager = eager;
      }
  
      @Override
      protected void subscribeActual(FolyamSubscriber<? super T> s) {
          R res;
  
          try {
              res = resourceSupplier.call();
          } catch (Throwable ex) {
              EmptySubscription.error(s, ex);
              return;
          }
  
          Esetleg<? extends T> p;
  
          try {
              p = Objects.requireNonNull(flowSupplier.apply(res), "The flowSupplier returned a null Flow.Publisher");
          } catch (Throwable ex) {
              if (eager) {
                  try {
                      resourceCleanup.accept(res);
                  } catch (Throwable exc) {
                      ex = new CompositeThrowable(ex, exc);
                  }
                  EmptySubscription.error(s, ex);
              } else {
                  EmptySubscription.error(s, ex);
                  try {
                      resourceCleanup.accept(res);
                  } catch (Throwable exc) {
                      FolyamPlugins.onError(exc);
                  }
              }
              return;
          }
  
          if (s instanceof ConditionalSubscriber) {
              p.subscribe(new FolyamUsing.UsingConditionalSubscriber<>((ConditionalSubscriber<? super T>)s, res, resourceCleanup, eager));
          } else {
              p.subscribe(new FolyamUsing.UsingSubscriber<>(s, res, resourceCleanup, eager));
          }
      }
  }
  